php--图片加水印文字

<?php
$image = imagecreatefromjpeg("upload/cat.jpg");

$pink = imagecolorallocate($image,66,66,66);

$font_file = "c:\\windows\\fonts\\simsun.ttc";

$str = "虾米大王！^^";

$str = mb_convert_encoding($str,"UTF-8","UTF8,GB2312,GBK");

imagettftext($image,25,10,140,240,$pink,$font_file,$str);

imagejpeg($image,"upload/ttf.jpg",100);

imagedestroy($image);

?>

<span>shi yong php gei tu pian jia wen zi </span>
<hr>
<table>
    <tr>
        <td>yuan tu:</td>
        <td>jia wen zi hou de tu pian:</td>
    </tr>
    <tr>
        <td><img src="upload/cat.jpg"></td>
        <td><img src="upload/ttf.jpg"></td>
    </tr>
</table>